Tfx
[医][=thymic factor x]胸腺因子x
🗣️ 情景例句
But, like your Grandpa suggested,
但是， 照你爷爷所建议的，
The mountains have brought forth a mouse.
大山生小鼠（指：费力大而收效小）。
Libraries made education possible, and education in its turn added to libraries: the growth of knowledge followed a kind of compound interest law, which was greatly enhanced by the invention of printing.
藏书使教育成为可能，而教育反过来又丰富了藏书，因为知识的增长遵循着一种“滚雪球”的规律。印刷术的发明又大大提高了知识增长的速度。